CVE-2026-55564
Fixed in a distro release EPSS <1%CVSS 5.4
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, the glyph_cache_get function in libfreerdp/cache/glyph.c checks whether index is greater than cache->number instead of greater than or equal to it. A malicious RDP server can use GLYPH_FRAGMENT_USE replay in update_process_glyph_fragments to make the default cache receive index 254 when cache->number is 254, reading one pointer beyond the entries array and dereferencing it as a glyph. This can crash the client and may disclose adjacent heap data. This issue is fixed in version 3.27.0.
Products: FreeRDP
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux 2 | freerdp | 2:2.11.7-1.amzn2.0.13 |
| Amazon Linux 2 | freerdp-devel | 2:2.11.7-1.amzn2.0.13 |
| Amazon Linux 2 | freerdp-libs | 2:2.11.7-1.amzn2.0.13 |
| Amazon Linux 2 | libwinpr | 2:2.11.7-1.amzn2.0.13 |
| Amazon Linux 2 | libwinpr-devel | 2:2.11.7-1.amzn2.0.13 |
| Amazon Linux 2023 | freerdp | 2:3.6.3-1.amzn2023.0.13 |
| Amazon Linux 2023 | freerdp-devel | 2:3.6.3-1.amzn2023.0.13 |
| Amazon Linux 2023 | freerdp-libs | 2:3.6.3-1.amzn2023.0.13 |
| Amazon Linux 2023 | freerdp-server | 2:3.6.3-1.amzn2023.0.13 |
| Amazon Linux 2023 | libwinpr | 2:3.6.3-1.amzn2023.0.13 |
| Amazon Linux 2023 | libwinpr-devel | 2:3.6.3-1.amzn2023.0.13 |
| Debian 12 | freerdp2 | no fix |
| Debian 13 | freerdp3 | no fix |
| Debian 14 | freerdp3 | 3.27.0+dfsg-1 |
| Ubuntu 16.04 LTS | freerdp | no fix |
| Ubuntu 18.04 LTS | freerdp | no fix |
| Ubuntu 22.04 LTS | freerdp2 | no fix |
| Ubuntu 24.04 LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.24.04.1 |
| Ubuntu 25.10 | freerdp3 | no fix |
| Ubuntu 26.04 LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.26.04.1 |
| Ubuntu Pro 18.04 LTS | freerdp2 | no fix |
| Ubuntu Pro 20.04 LTS | freerdp2 | no fix |
| Ubuntu Pro 24.04 LTS | freerdp2 | no fix |